Sturdy
The Pokémon cannot be knocked out by a single hit as long as its HP is full. One-hit KO moves will also fail to knock it out.
Weak Armor
Physical attacks to the Pokémon lower its Defense stat but sharply raise its Speed stat.
It’s as hard as steel, but apparently a long soak in water will cause it to soften a bit.
When it detects a noise, it starts to move. The energy core inside it makes this Pokémon slightly warm to the touch.